CA2848894A1 - Gokhman tidal power plant for lagoon - Google Patents
Gokhman tidal power plant for lagoon Download PDFInfo
- Publication number
- CA2848894A1 CA2848894A1 CA2848894A CA2848894A CA2848894A1 CA 2848894 A1 CA2848894 A1 CA 2848894A1 CA 2848894 A CA2848894 A CA 2848894A CA 2848894 A CA2848894 A CA 2848894A CA 2848894 A1 CA2848894 A1 CA 2848894A1
- Authority
- CA
- Canada
- Prior art keywords
- lagoon
- reservoir
- version
- head
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
- F03B13/268—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy making use of a dam
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Abstract
The invention is tidal power plant for lagoon. It has two versions. The first version of the invention has a head reservoir located on the lagoon shore, a power house separately located on the lagoon bed, a flow distributor delivering the water front the head reservoir to the power house turbines during power generation and at the end of flood delivering the water from lagoon to the head reservoir to fill it up. The second version of the invention is different front the first one by the presence of the tail reservoir. In tins version the power house is located inside the tail reservoir. The cylindrical wall surrounding the tail reservoir keeps the water level in it significantly lower than the water level in lagoon during the power generation. This cylindrical wall has vertical sluices emptying the tail reservoir at the end of ebb.
Due to the fact that the construction cost of the first version of invention is much smaller than of artificial basin in well known Inazin design it can have for much smaller cost the larger area. As the result with the same power equipment it annually generates on 45% more energy than Inazin design.
The construction cost of the second version is higher titan the first if they have the same power equipment, however due to the higher head during power generation the second version annually generates on 30% more than the first version.
Due to the fact that the construction cost of the first version of invention is much smaller than of artificial basin in well known Inazin design it can have for much smaller cost the larger area. As the result with the same power equipment it annually generates on 45% more energy than Inazin design.
The construction cost of the second version is higher titan the first if they have the same power equipment, however due to the higher head during power generation the second version annually generates on 30% more than the first version.
Description
GOKHMAN TIDAL POWER PLANT FOR LAGOON
BACKGROUND OF THE INVENTION
Tidal power plants are the most reliable sourss of clean energy. There are two types of tidal power plants. The first type is the tidal power plant to be constructed on the bays and estuaries like The Bay of Fundy, Severn Lake, etc. The second type is the tidal power plant to be constructed on the lagoons like Swansea Lagoon.
The are two tidal plants of the first type constructed in 1966 in France, Rance Tidal Power Station ; and in 2011 constructed in South Korea, Sihwa Lake Tidal Power Station. There are no already constructed of the second type. The first tidal plant for lagoon is being designed in U.K for Swansea Lagoon. The present invention is the first effort to propose economically effective concept for the design of power plants for lagoons.
DESCRIPTION OF PRIOR ART
This invention relates to tidal power plants for lagoons.
As far as it is known to me there are no tidal power plants built on lagoons, and there is the only one conceptual design of a tidal power plant for Swansea Lagoon in U.K. which was developed by Inazin.
As it is well known, lagoons are wide and shallow, therefore it is impossible to design for any lagoon an economically feasible tidal plant with a barrage comprising a power house between two different points on the lagoon shore. So the Inazin conceptual design is based on the idea of constructing an artificial basin separated from the rest of the lagoon by a barrage that is a vertical wall erected along a closed line which in plan approximates a circle with diameter, Du, = 3, 5km, that touches the lagoon shore at a point with elevation, Z 0. The power house in the Inazin design is an integral part of the barrage and is located at the lowest part of the barrage.
The cylindrical wall forming the basin (basin wall) is built from concrete and has the height variating from 4 meters at the shore to 8 meters at the deepest part in order to operate with the tide having an amplitude, At = 4m. The Inazin tidal plant equipped with 15 bidirectional turbines with runner diameter, Dt = 6m, annually generates 425.17GWh. So the lagoon tidal power plant developed by Inazin is also not economically very attractive, because of the high cost of the basin wall and small annual energy output.
BACKGROUND OF THE INVENTION
Tidal power plants are the most reliable sourss of clean energy. There are two types of tidal power plants. The first type is the tidal power plant to be constructed on the bays and estuaries like The Bay of Fundy, Severn Lake, etc. The second type is the tidal power plant to be constructed on the lagoons like Swansea Lagoon.
The are two tidal plants of the first type constructed in 1966 in France, Rance Tidal Power Station ; and in 2011 constructed in South Korea, Sihwa Lake Tidal Power Station. There are no already constructed of the second type. The first tidal plant for lagoon is being designed in U.K for Swansea Lagoon. The present invention is the first effort to propose economically effective concept for the design of power plants for lagoons.
DESCRIPTION OF PRIOR ART
This invention relates to tidal power plants for lagoons.
As far as it is known to me there are no tidal power plants built on lagoons, and there is the only one conceptual design of a tidal power plant for Swansea Lagoon in U.K. which was developed by Inazin.
As it is well known, lagoons are wide and shallow, therefore it is impossible to design for any lagoon an economically feasible tidal plant with a barrage comprising a power house between two different points on the lagoon shore. So the Inazin conceptual design is based on the idea of constructing an artificial basin separated from the rest of the lagoon by a barrage that is a vertical wall erected along a closed line which in plan approximates a circle with diameter, Du, = 3, 5km, that touches the lagoon shore at a point with elevation, Z 0. The power house in the Inazin design is an integral part of the barrage and is located at the lowest part of the barrage.
The cylindrical wall forming the basin (basin wall) is built from concrete and has the height variating from 4 meters at the shore to 8 meters at the deepest part in order to operate with the tide having an amplitude, At = 4m. The Inazin tidal plant equipped with 15 bidirectional turbines with runner diameter, Dt = 6m, annually generates 425.17GWh. So the lagoon tidal power plant developed by Inazin is also not economically very attractive, because of the high cost of the basin wall and small annual energy output.
SUMMARY OF THE INVENTION
The invention is tidal power plant for lagoon. It has two versions.
The first version of the invention has a head reservoir located either on the lagoon shore, or on the lagoon bed along the shore edge, a power house separately located on the lagoon bed, a flow distributor delivering the water from the head reservoir to the power house turbines during power generation and at the end of flood delivering the water from lagoon to the head reservoir to fill it up.The power house is located at the dip place of the lagoon providing the requirement that the upper part of the hydro-turbine draft tube i.e. it is under water at the lowest level of the ebb.
The second version of the invention is different from the first one by the presence of the tail reservoir. In this version the power house is located inside the tail reser-voir. The cylindrical wall surrounding the tail reservoir keeps the water level in it significantly lower than the water level in lagoon during the power generation. This cylindrical wall has vertical sluices emptying the tail reservoir at the end of ebb.
Due to the fact that the construction cost of the first version of invention is much smaller than of artificial basin in well known Inazin design it can have for much smaller cost the larger area. As the result with the same power equipment it annually generates on 45% more energy than Inazin design.
The construction cost of the second version is higher than the first if they have the same power equipment, however due to the higher head during power generation the second version annually generates on 30% more than the first version.
The invention is tidal power plant for lagoon. It has two versions.
The first version of the invention has a head reservoir located either on the lagoon shore, or on the lagoon bed along the shore edge, a power house separately located on the lagoon bed, a flow distributor delivering the water from the head reservoir to the power house turbines during power generation and at the end of flood delivering the water from lagoon to the head reservoir to fill it up.The power house is located at the dip place of the lagoon providing the requirement that the upper part of the hydro-turbine draft tube i.e. it is under water at the lowest level of the ebb.
The second version of the invention is different from the first one by the presence of the tail reservoir. In this version the power house is located inside the tail reser-voir. The cylindrical wall surrounding the tail reservoir keeps the water level in it significantly lower than the water level in lagoon during the power generation. This cylindrical wall has vertical sluices emptying the tail reservoir at the end of ebb.
Due to the fact that the construction cost of the first version of invention is much smaller than of artificial basin in well known Inazin design it can have for much smaller cost the larger area. As the result with the same power equipment it annually generates on 45% more energy than Inazin design.
The construction cost of the second version is higher than the first if they have the same power equipment, however due to the higher head during power generation the second version annually generates on 30% more than the first version.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic plan view of Gokhman tidal power plant first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake delivering the water from the distributor to the power house during power generation.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
FIG. 3 is a schematic plan view of a flow distributor.
FIG. 4 is a schematic side elevation view, partially in cross-section, of a the power house.
FIG. 5 is a schematic plan view of Gokhman tidal power plant second version which as the first version, presented in FIG 1, has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and com-mon intake delivering the water from the distributor to the power house during power generation. The difference between the second and the first versions is in the presence of tail reservoir.
FIG. 6 is a schematic side elevation view, partially in cross-section, of a power house of Gokhman tidal power plant second version The difference between the second version and the first version on the FIG 4 is only in the presence of tail reservoir.
FIG. 1 is a schematic plan view of Gokhman tidal power plant first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake delivering the water from the distributor to the power house during power generation.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
FIG. 3 is a schematic plan view of a flow distributor.
FIG. 4 is a schematic side elevation view, partially in cross-section, of a the power house.
FIG. 5 is a schematic plan view of Gokhman tidal power plant second version which as the first version, presented in FIG 1, has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and com-mon intake delivering the water from the distributor to the power house during power generation. The difference between the second and the first versions is in the presence of tail reservoir.
FIG. 6 is a schematic side elevation view, partially in cross-section, of a power house of Gokhman tidal power plant second version The difference between the second version and the first version on the FIG 4 is only in the presence of tail reservoir.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The first version of Gokhman tidal power plant for lagoon The first version discloses a Lagoon tidal power plant without either natural or artificial basin, but with an artificial head reservoir constructed on the lagoon shore at an available place. It also has a separate power house equipped with Bulb turbines and located inside the lagoon at some place providing the upper parts of the turbine draft tubes to be below the lowest water level at the ebb end. In addition to that, the first version of tidal power plant has a flow distributor located at the lagoon shore and connected with head reservoir by means of an open channel. It also has a common intake connecting the flow distributor with the power house bulb turbines.
The flow distributor has gates which are opened at the very end of the flood to admit water from the lagoon to fill the upper reservoir. Said power plant is a one-way tidal power plant working during ebb and the flood and getting water from the head reservoir via the channel, the flow distributor, and the common intake.
The lagoon itself presents the tail reservoir for this version of of the plant.
The first version of the invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic plan view of Gokhman tidal power plant first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake delivering the water from the distributor to the power house during power generation.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
FIG. 3 is a schematic plan view of a flow distributor.
FIG. 4 is a schematic side elevation view, partially in cross-section, of a the power house.
Referring now to FIG. 1, a schematic plan view of Gokhman tidal power plant for lagoon first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake deliv-ering the water from the distributor to the power house during power generation.
The tidal plant comprises a head reservoir 1 located on the lagoon shore 2, an open channel 4, a flow distributor 5, common intake 6, and a power house 7 located on the bed of the lagoon 3. During the very end of the flood the flow distributor fills the head reservoir 1 with the water from the lagoon 3 through its gates via the channel 4. The flow distributor 5 also supplies the power house 7 during the ebb and flood power generations with the water from the head reservoir 1 via the open channel 4 and the common intake 6.
Referring now to FIG. 2, a schematic elevation view in cross-section, of a head reser-voir of the first version of Gokhman tidal plant. The head reservoir is constructed on the lagoon shore dry land 1 with elevation, VZdi. As can be seen in FIG. 2 the head reservoir is formed with a flat bottom 3 having elevation VZhrb and cylindrical side wall 4. The head reservoir is open at the top and the top elevation of its side wall 4 is V47.1. The water 2 in the head reservoir is always below VZhrt.
FIG. 2 shows the head reservoir for the case:
Zhrb < Zdl < Zhrt (1) The current head of Gokhman tidal plant first version is determined as:
H = Zh AtideSin[Ct(T TO)] (2) where:
T is the time in seconds, Zh = Zh(T) is the current water level in the head reservoir, Atide is the tide level amplitude, and Ct = 7r/21,600 It is clear from equation (2) that in order for the head reservoir to be filled to the lagoon highest water level Zhrt in (1) must be equal to Atide . The value of Zhrh in (1) has to be equal to minimum water level in the head reservoir, (Zh),t, required by the tidal plant operation.
So the equation (1) can be rewritten as:
(ZOntin < Zdl < Atide (3) The equation describing the change of the water level in the head reservoir, Z11 as the function of time is the well known nonlinear ordinary differential equation of the first order:
dzh dT Ah (4) where:
T is the current time in seconds, = 4(T) is the water level in the head reservoir, Q = Q(T) is the flow through the power house, and Ah is the head reservoir horizontal cross-section area.
As can be seen from equation (4) with bigger values of Ah the values of dZhIdT
are smaller and, therefore the value of Zh is higher for the same function Q =
Q(T).
Now it is clear from equation (4) that the power plant head, H, is higher with nigher values of Ah for the same function Q = Q(T). Consequently the decrease of head in Gokhman tidal power plant for lagoon first version (Gokhman tidal plant) during operation strongly depends on the head reservoir area.
The computations conducted by the applicant for the comparison of the present invention with Inazin tidal power plant showed the following results. The power houses of both plants are equipped with frequency converters permitting to the turbines of both plants to work at optimal operating regimes.
Inazin tidal plant.
Input data:
The diameter of the basin wall, Dbu, = 3.46km The area inside the basin wall, Alm, = 9.37km2.
The number of bidirectional turbines, Nt = 15.
The turbine runner diameter, Dt = 6m.
The optimal discharge capacity in ebb direction, (Qii)op.,= 2.031m3/sec.
The optimal discharge capacity in flood direction, (Qii) op. f = 2.031M3 /sec.
The peak efficiency in ebb direction, rime = 0.95.
The peak efficiency in flood direction, np.f = 0.80.
Output data:
The minimum water level in the basin, (Zb),,in, = ¨1.69m The maximum head Hma, = 5.38m The annual energy output, Eõ= 425.17GWlir.
Gokhman tidal plant first version.
Input data:
The diameter of the head reservoir, DI, = 6.92km The area of the head reservoir, Ah = 37.48km2.
The number of one-directional bulb turbines, Nt = 15.
The turbine runner diameter, Dt = 6m.
The optimal discharge capacity, (Qii)op = 2.031m3/sec The peak efficiency, ?II, = 0.95 Output data:
The minimum water level in the head reservoir, (Zh )Tnin = 2.31m The maximum head 1-1,-õ, = 7.087n The annual energy output, Eõ = 646.66GWhr This comparison between Gokhman and Inazin tidal plants for lagoon shows that with Dh = 2131hzu Gokhman tidal plant generate annually 52% more energy than Inazin tidal plant. It is also clear that if the Swansea lagoon shore dry land elevation, Zdi, satisfies equation (1) the head reservoir for Gokhman tidal plant will be less expensive than the Inazin concrete basin. Indeed, in the case of Zdi =
(Zh)rnin Gokhman head reservoir can be made of earth round wall with height of 1.69 meters and the diameter of 6,920 meters versus Inazin basin concrete wall with the diameter of 3,460 meters and the average height of 6 meters. It easy to see that the surface area of Inazin basin wall will be 50% bigger than Gokhman head reservoir wall.
The first version of Gokhman tidal power plant for lagoon The first version discloses a Lagoon tidal power plant without either natural or artificial basin, but with an artificial head reservoir constructed on the lagoon shore at an available place. It also has a separate power house equipped with Bulb turbines and located inside the lagoon at some place providing the upper parts of the turbine draft tubes to be below the lowest water level at the ebb end. In addition to that, the first version of tidal power plant has a flow distributor located at the lagoon shore and connected with head reservoir by means of an open channel. It also has a common intake connecting the flow distributor with the power house bulb turbines.
The flow distributor has gates which are opened at the very end of the flood to admit water from the lagoon to fill the upper reservoir. Said power plant is a one-way tidal power plant working during ebb and the flood and getting water from the head reservoir via the channel, the flow distributor, and the common intake.
The lagoon itself presents the tail reservoir for this version of of the plant.
The first version of the invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a schematic plan view of Gokhman tidal power plant first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake delivering the water from the distributor to the power house during power generation.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
FIG. 3 is a schematic plan view of a flow distributor.
FIG. 4 is a schematic side elevation view, partially in cross-section, of a the power house.
Referring now to FIG. 1, a schematic plan view of Gokhman tidal power plant for lagoon first version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake deliv-ering the water from the distributor to the power house during power generation.
The tidal plant comprises a head reservoir 1 located on the lagoon shore 2, an open channel 4, a flow distributor 5, common intake 6, and a power house 7 located on the bed of the lagoon 3. During the very end of the flood the flow distributor fills the head reservoir 1 with the water from the lagoon 3 through its gates via the channel 4. The flow distributor 5 also supplies the power house 7 during the ebb and flood power generations with the water from the head reservoir 1 via the open channel 4 and the common intake 6.
Referring now to FIG. 2, a schematic elevation view in cross-section, of a head reser-voir of the first version of Gokhman tidal plant. The head reservoir is constructed on the lagoon shore dry land 1 with elevation, VZdi. As can be seen in FIG. 2 the head reservoir is formed with a flat bottom 3 having elevation VZhrb and cylindrical side wall 4. The head reservoir is open at the top and the top elevation of its side wall 4 is V47.1. The water 2 in the head reservoir is always below VZhrt.
FIG. 2 shows the head reservoir for the case:
Zhrb < Zdl < Zhrt (1) The current head of Gokhman tidal plant first version is determined as:
H = Zh AtideSin[Ct(T TO)] (2) where:
T is the time in seconds, Zh = Zh(T) is the current water level in the head reservoir, Atide is the tide level amplitude, and Ct = 7r/21,600 It is clear from equation (2) that in order for the head reservoir to be filled to the lagoon highest water level Zhrt in (1) must be equal to Atide . The value of Zhrh in (1) has to be equal to minimum water level in the head reservoir, (Zh),t, required by the tidal plant operation.
So the equation (1) can be rewritten as:
(ZOntin < Zdl < Atide (3) The equation describing the change of the water level in the head reservoir, Z11 as the function of time is the well known nonlinear ordinary differential equation of the first order:
dzh dT Ah (4) where:
T is the current time in seconds, = 4(T) is the water level in the head reservoir, Q = Q(T) is the flow through the power house, and Ah is the head reservoir horizontal cross-section area.
As can be seen from equation (4) with bigger values of Ah the values of dZhIdT
are smaller and, therefore the value of Zh is higher for the same function Q =
Q(T).
Now it is clear from equation (4) that the power plant head, H, is higher with nigher values of Ah for the same function Q = Q(T). Consequently the decrease of head in Gokhman tidal power plant for lagoon first version (Gokhman tidal plant) during operation strongly depends on the head reservoir area.
The computations conducted by the applicant for the comparison of the present invention with Inazin tidal power plant showed the following results. The power houses of both plants are equipped with frequency converters permitting to the turbines of both plants to work at optimal operating regimes.
Inazin tidal plant.
Input data:
The diameter of the basin wall, Dbu, = 3.46km The area inside the basin wall, Alm, = 9.37km2.
The number of bidirectional turbines, Nt = 15.
The turbine runner diameter, Dt = 6m.
The optimal discharge capacity in ebb direction, (Qii)op.,= 2.031m3/sec.
The optimal discharge capacity in flood direction, (Qii) op. f = 2.031M3 /sec.
The peak efficiency in ebb direction, rime = 0.95.
The peak efficiency in flood direction, np.f = 0.80.
Output data:
The minimum water level in the basin, (Zb),,in, = ¨1.69m The maximum head Hma, = 5.38m The annual energy output, Eõ= 425.17GWlir.
Gokhman tidal plant first version.
Input data:
The diameter of the head reservoir, DI, = 6.92km The area of the head reservoir, Ah = 37.48km2.
The number of one-directional bulb turbines, Nt = 15.
The turbine runner diameter, Dt = 6m.
The optimal discharge capacity, (Qii)op = 2.031m3/sec The peak efficiency, ?II, = 0.95 Output data:
The minimum water level in the head reservoir, (Zh )Tnin = 2.31m The maximum head 1-1,-õ, = 7.087n The annual energy output, Eõ = 646.66GWhr This comparison between Gokhman and Inazin tidal plants for lagoon shows that with Dh = 2131hzu Gokhman tidal plant generate annually 52% more energy than Inazin tidal plant. It is also clear that if the Swansea lagoon shore dry land elevation, Zdi, satisfies equation (1) the head reservoir for Gokhman tidal plant will be less expensive than the Inazin concrete basin. Indeed, in the case of Zdi =
(Zh)rnin Gokhman head reservoir can be made of earth round wall with height of 1.69 meters and the diameter of 6,920 meters versus Inazin basin concrete wall with the diameter of 3,460 meters and the average height of 6 meters. It easy to see that the surface area of Inazin basin wall will be 50% bigger than Gokhman head reservoir wall.
Generally speaking the head reservoir of Gokhman tidal plant can be built on dry land if the geography and topography of the lagoon shore allow this construction.
And besides equation (3) there are two other substantially different cases:
Z dl < (Z11)111in (5) The land available for the head reservoir is bellow the water in the head reservoir at required minimum elevation. In this case no land excavation is required and the head reservoir has to be constructed by surrounding its future bottom with the wall of the appropriate hight.
Atide < Zdl (6) The land available for the head reservoir above than of the water in the head reservoir at the flood highest level. In this case the head reservoir has to be constructed by land excavation.
There are also other environmental considerations prohibiting the construction of the single head reservoir on the lagoon shore dry land. In some cases the head reservoir can be formed from several reservoirs connected with water ways. In some cases the head reservoir parts can be constructed on the lagoon bed along the lagoon brim. It is clear that these head reservoir parts must be separated from the lagoon by concrete walls.
Referring now to FIG. 3, a schematic plan view of a flow distributor. The flow distributor is constructed along the brim 9 of the lagoon 8. The flow distributor is formed with the vertical wall I and the flat rectangular bottom 2 and is open at the top. The frontal part 6 of the wall I facing the lagoon 8 is fitted with vertical sluices 6. The lower brims of the sluices 6 are located at the level below the lagoon water at the highest level, A. The rear part of the wall 1 facing the head reservoir located at the lagoon shore 7 has the opening for the channel 5 connecting the flow distributor with the head reservoir. At the flat bottom 2 there is an opening 3 for the common intake 4 delivering the water to the power house.
Referring now to FIG. 4, a schematic side elevation view, partially in cross-section, of a power house. The power house 1 is a separate structure constructed on the lagoon bed 2 at the location providing that the elevation of the draft tube exit 5 top, Z dtet, is lower than the minimum level of the water 3 in the lagoon, Zimin. The maximum level of the water 3 in the lagoon is Zintax. The power house 1 turbines receive the water from the common intake 4.
The second version of Gokhman tidal power plant for lagoon.
The second version is different from the first version only by comprising an artificial tail reservoir built around the power house.
The second version of the invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 5 is a schematic plan view of Gokhman tidal power plant second version which =
as the first version, presented in FIG. 1, has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and com-mon intake delivering the water from the distributor to the power house during power generation. The difference between the second and the first versions is in the presence of tail reservoir.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
The head reservoir of the second version is identical to the head reservoir of the first version.
FIG. 3 is a schematic plan view of a flow distributor. The flow distributor of the second version is identical to the flow distributor of the first version.
FIG. 6 is a schematic side elevation view, partially in cross-section, of a power house of Gokhman tidal power plant second version The difference between the second version and the first version on the FIG. 4 is only in the presence of tail reservoir.
Referring now to FIG. 5, a schematic plan view of Gokhman tidal power plant for lagoon second version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake deliv-ering the water from the distributor to the power house during power generation.
The tidal plant comprises a head reservoir 1 located on lagoon shore 2, an open channel 4, a flow distributor 5, common intake 6, and a power house 7 located on the the bed of the lagoon 3. During the very end of the flood the flow distributor fills the head reservoir 1 with the water from the lagoon 3 through its gates via the channel 4. The flow distributor 5 also supplies the power house 7 during the ebb and flood power generation with the water from the head reservoir 1 via the open channel 4 and the common intake 6. The power plant also comprises the tail reservoir 8 formed by the cylindrical wall 9. The power house 7 is located inside the tail reservoir 8 and is facing sluices 10 in the wall 9. The sluices 9 are emptying the tail reservoir 8 at the very end of the ebb and bring the water level in the reservoir 8 to the lowest tide level.
Referring now to FIG. 6, a schematic side elevation view, partially in cross-section, of tail reservoir with power house of Gokhman tidal power plant for lagoon second version. The tail reservoir 3 is constructed on the lagoon bed 1 and is formed by the cylindrical wall 6. The elevation of the wall 6 top Ztrtot is higher than the maximum level of the water 7 in the lagoon VZimax. The power house 2 is a separate structure constructed on the lagoon bed 1 inside the tail reservoir 3 at the location providing that the elevation of the draft tube exit 5 top, Zdtet, is lower than the minimum level of the water in the lagoon 7, VZirnin. .The power house 2 turbines receive the water from the common intake 4. The wall 6 has vertical sluices 8 facing the exit draft tube exit 5. The sluices 8 are emptying the tail reservoir at the end of ebb. As the result the maximum level of the water 7 in the lagoon, VZ/niax, is significantly higher than the maximum level of the water in the tail reservoir 3, VZtrmax=
The current head of Gokhman tidal plant second version is determined as:
H = Zh ¨ Zt (7) where:
Zh is the water level in the head reservoir described by equation (4), and Zt is the water level in the tail reservoir The water level in the tail reservoir is described by the following equation:
dZ t Q
(8) dT At where:
Zt = Z(T) is the water level in the tail reservoir Q = Q(T) is the flow through the power house, and At is the tail reservoir horizontal cross-section area So using equations (4), (7), and (8) one is getting the differential equation for current head, H, in the Gokhinan tidal plant second version:
dH
dT A (9) where:
A, = AhAt/(Ah + At) is the effective power plant reservoirs area Let Qi ND(Q11)0p (10) where:
Nu is the number of units in the power house, Dt is the turbine diameter runner diameter, and (Qii)op is the unit flow at optimum operating regime =
Then the formula for Q:
Q = Q (11) and from (9) and (10):
dH-QiH 5 ¨dT (12) A, The integral of equation (11) gives the equation for H in the Gokhman tidal plant second version:
H = (BT + H8.5)2 (13) where:
B = ¨Q1/(2,4e) and Ho = H(T0) The equation (13) enables the analytical computation of the annual energy output for the Gokhinan tidal plant second version. For the same power equipment and the head reservoir as for Gokhman tidal plant first version the second version annual energy output, Ea, = 842.69GWhr, or 30% higher.
And besides equation (3) there are two other substantially different cases:
Z dl < (Z11)111in (5) The land available for the head reservoir is bellow the water in the head reservoir at required minimum elevation. In this case no land excavation is required and the head reservoir has to be constructed by surrounding its future bottom with the wall of the appropriate hight.
Atide < Zdl (6) The land available for the head reservoir above than of the water in the head reservoir at the flood highest level. In this case the head reservoir has to be constructed by land excavation.
There are also other environmental considerations prohibiting the construction of the single head reservoir on the lagoon shore dry land. In some cases the head reservoir can be formed from several reservoirs connected with water ways. In some cases the head reservoir parts can be constructed on the lagoon bed along the lagoon brim. It is clear that these head reservoir parts must be separated from the lagoon by concrete walls.
Referring now to FIG. 3, a schematic plan view of a flow distributor. The flow distributor is constructed along the brim 9 of the lagoon 8. The flow distributor is formed with the vertical wall I and the flat rectangular bottom 2 and is open at the top. The frontal part 6 of the wall I facing the lagoon 8 is fitted with vertical sluices 6. The lower brims of the sluices 6 are located at the level below the lagoon water at the highest level, A. The rear part of the wall 1 facing the head reservoir located at the lagoon shore 7 has the opening for the channel 5 connecting the flow distributor with the head reservoir. At the flat bottom 2 there is an opening 3 for the common intake 4 delivering the water to the power house.
Referring now to FIG. 4, a schematic side elevation view, partially in cross-section, of a power house. The power house 1 is a separate structure constructed on the lagoon bed 2 at the location providing that the elevation of the draft tube exit 5 top, Z dtet, is lower than the minimum level of the water 3 in the lagoon, Zimin. The maximum level of the water 3 in the lagoon is Zintax. The power house 1 turbines receive the water from the common intake 4.
The second version of Gokhman tidal power plant for lagoon.
The second version is different from the first version only by comprising an artificial tail reservoir built around the power house.
The second version of the invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 5 is a schematic plan view of Gokhman tidal power plant second version which =
as the first version, presented in FIG. 1, has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and com-mon intake delivering the water from the distributor to the power house during power generation. The difference between the second and the first versions is in the presence of tail reservoir.
FIG. 2 is a schematic elevation view, in cross-section, of a head reservoir.
The head reservoir of the second version is identical to the head reservoir of the first version.
FIG. 3 is a schematic plan view of a flow distributor. The flow distributor of the second version is identical to the flow distributor of the first version.
FIG. 6 is a schematic side elevation view, partially in cross-section, of a power house of Gokhman tidal power plant second version The difference between the second version and the first version on the FIG. 4 is only in the presence of tail reservoir.
Referring now to FIG. 5, a schematic plan view of Gokhman tidal power plant for lagoon second version which has a head reservoir, a flow distributor connected with head reservoir by means of open channel, a power house, and common intake deliv-ering the water from the distributor to the power house during power generation.
The tidal plant comprises a head reservoir 1 located on lagoon shore 2, an open channel 4, a flow distributor 5, common intake 6, and a power house 7 located on the the bed of the lagoon 3. During the very end of the flood the flow distributor fills the head reservoir 1 with the water from the lagoon 3 through its gates via the channel 4. The flow distributor 5 also supplies the power house 7 during the ebb and flood power generation with the water from the head reservoir 1 via the open channel 4 and the common intake 6. The power plant also comprises the tail reservoir 8 formed by the cylindrical wall 9. The power house 7 is located inside the tail reservoir 8 and is facing sluices 10 in the wall 9. The sluices 9 are emptying the tail reservoir 8 at the very end of the ebb and bring the water level in the reservoir 8 to the lowest tide level.
Referring now to FIG. 6, a schematic side elevation view, partially in cross-section, of tail reservoir with power house of Gokhman tidal power plant for lagoon second version. The tail reservoir 3 is constructed on the lagoon bed 1 and is formed by the cylindrical wall 6. The elevation of the wall 6 top Ztrtot is higher than the maximum level of the water 7 in the lagoon VZimax. The power house 2 is a separate structure constructed on the lagoon bed 1 inside the tail reservoir 3 at the location providing that the elevation of the draft tube exit 5 top, Zdtet, is lower than the minimum level of the water in the lagoon 7, VZirnin. .The power house 2 turbines receive the water from the common intake 4. The wall 6 has vertical sluices 8 facing the exit draft tube exit 5. The sluices 8 are emptying the tail reservoir at the end of ebb. As the result the maximum level of the water 7 in the lagoon, VZ/niax, is significantly higher than the maximum level of the water in the tail reservoir 3, VZtrmax=
The current head of Gokhman tidal plant second version is determined as:
H = Zh ¨ Zt (7) where:
Zh is the water level in the head reservoir described by equation (4), and Zt is the water level in the tail reservoir The water level in the tail reservoir is described by the following equation:
dZ t Q
(8) dT At where:
Zt = Z(T) is the water level in the tail reservoir Q = Q(T) is the flow through the power house, and At is the tail reservoir horizontal cross-section area So using equations (4), (7), and (8) one is getting the differential equation for current head, H, in the Gokhinan tidal plant second version:
dH
dT A (9) where:
A, = AhAt/(Ah + At) is the effective power plant reservoirs area Let Qi ND(Q11)0p (10) where:
Nu is the number of units in the power house, Dt is the turbine diameter runner diameter, and (Qii)op is the unit flow at optimum operating regime =
Then the formula for Q:
Q = Q (11) and from (9) and (10):
dH-QiH 5 ¨dT (12) A, The integral of equation (11) gives the equation for H in the Gokhman tidal plant second version:
H = (BT + H8.5)2 (13) where:
B = ¨Q1/(2,4e) and Ho = H(T0) The equation (13) enables the analytical computation of the annual energy output for the Gokhinan tidal plant second version. For the same power equipment and the head reservoir as for Gokhman tidal plant first version the second version annual energy output, Ea, = 842.69GWhr, or 30% higher.
Claims (9)
1. A tidal power plant for lagoon comprising a head reservoir and an one-way power house;
said one-way power house is detached from said head reservoir and is located on lagoon bed;
said one-way power house generates power during ebb and flood with water delivered from said head reservoir;
wherein said head reservoir is filled with lagoon water at end of flood.
said one-way power house is detached from said head reservoir and is located on lagoon bed;
said one-way power house generates power during ebb and flood with water delivered from said head reservoir;
wherein said head reservoir is filled with lagoon water at end of flood.
2. A tidal power plant for lagoon of claim 1 comprising a tail reservoir;
said tail reservoir is formed by the wall constructed around said power house;
wherein said tail reservoir is emptied of water at end of ebb via vertical sluices located in said wall.
said tail reservoir is formed by the wall constructed around said power house;
wherein said tail reservoir is emptied of water at end of ebb via vertical sluices located in said wall.
3. A tidal power plant for lagoon of claim 1 in which said head reservoir consists of several parts connected between themselves with water ways;
wherein some of said parts are located on lagoon bed along lagoon shore edge.
wherein some of said parts are located on lagoon bed along lagoon shore edge.
4. A tidal power plant for lagoon of claim 1 comprising a flow distributor;
said distributor is connected with said head reservoir with an open channel;
said distributor is connected with said one-way power house with a common intake;
wherein said common intake delivers water under pressure to said one-way power house turbines.
said distributor is connected with said head reservoir with an open channel;
said distributor is connected with said one-way power house with a common intake;
wherein said common intake delivers water under pressure to said one-way power house turbines.
5. A tidal power plant for lagoon of claim 4 in which said flow distributor is formed of four side walls and a flat bottom and is open at the top;
wherein one of said side walls facing lagoon shore has an opening for said open channel connecting said reservoir with said flow distributor;
wherein one of said side walls facing lagoon has gates for water flow from lagoon filling via said channel said head reservoir during flood end;
wherein said flat bottom has an opening for said common intake.
wherein one of said side walls facing lagoon shore has an opening for said open channel connecting said reservoir with said flow distributor;
wherein one of said side walls facing lagoon has gates for water flow from lagoon filling via said channel said head reservoir during flood end;
wherein said flat bottom has an opening for said common intake.
6. A tidal power plant for lagoon of claim 5 said one-way power house of which is equipped with bulb turbines, AC generators, and frequency converters.
7. A tidal power plant for lagoon of claim 2 comprising a flow distributor;
said distributor is connected with said head reservoir with an open channel;
said distributor is connected with said one-way power house with a common intake;
wherein said common intake delivers water under pressure to said one-way power house turbines.
said distributor is connected with said head reservoir with an open channel;
said distributor is connected with said one-way power house with a common intake;
wherein said common intake delivers water under pressure to said one-way power house turbines.
8. A tidal power plant for lagoon of claim 7 in which said flow distributor is formed of four side walls and a flat bottom and is open at the top;
wherein one of said side walls facing lagoon shore has an opening for said open channel connecting said reservoir with said flow distributor;
wherein one of said side walls facing lagoon has gates for water flow from lagoon filling via said channel said head reservoir during flood end;
wherein said flat bottom has an opening for said common intake.
wherein one of said side walls facing lagoon shore has an opening for said open channel connecting said reservoir with said flow distributor;
wherein one of said side walls facing lagoon has gates for water flow from lagoon filling via said channel said head reservoir during flood end;
wherein said flat bottom has an opening for said common intake.
9. A tidal power plant for lagoon of claim 8 said one-way power house of which is equipped with bulb turbines, AC generators,and frequency converters.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1307087.5 | 2013-04-19 | ||
| GB1307087.5A GB2513178A (en) | 2013-04-19 | 2013-04-19 | Gokhman tidal power plant for lagoon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2848894A1 true CA2848894A1 (en) | 2014-10-19 |
Family
ID=48537478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2848894A Abandoned CA2848894A1 (en) | 2013-04-19 | 2014-04-15 | Gokhman tidal power plant for lagoon |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2848894A1 (en) |
| GB (1) | GB2513178A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2551571B (en) | 2016-06-23 | 2018-06-27 | Red To Blue Ltd | A system and method for extracting power from tides |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB218102A (en) * | 1924-03-21 | 1924-07-03 | Leonard William Weaver | Improvements in or relating to apparatus for utilising tidal energy |
| GB2145165A (en) * | 1983-08-18 | 1985-03-20 | Hitoshi Kinno | Pumped storage system at tidal power site |
| ES2169006B2 (en) * | 2000-12-01 | 2003-04-01 | Univ Poilitecnica De Madrid | MAREOMOTRIC DEPOSIT CENTERS. |
| CN201221434Y (en) * | 2008-07-14 | 2009-04-15 | 浙江大学 | Double-warehouse self-adjusting tide energy power generation system |
| JP2012145091A (en) * | 2011-01-11 | 2012-08-02 | Hiromi Haraguchi | Tidal difference power generation |
-
2013
- 2013-04-19 GB GB1307087.5A patent/GB2513178A/en not_active Withdrawn
-
2014
- 2014-04-15 CA CA2848894A patent/CA2848894A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB201307087D0 (en) | 2013-05-29 |
| GB2513178A (en) | 2014-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9163606B2 (en) | Hydro-electric tube generation | |
| JP2018132068A (en) | Pumped-storage power station | |
| JP5701463B1 (en) | Power generation method | |
| US9500177B2 (en) | Electrical generation system based on tidal flow | |
| US20120237298A1 (en) | Under bottom dam wave energy converter | |
| ES2841349T3 (en) | A set to generate electricity | |
| CN112119213B (en) | Pump type hydroelectric energy storage system and method | |
| NZ565291A (en) | Power generation using immersed vessel(s) using off-peak electricity for pumping out water from vessel and to generate electricity via turbine during peak demand to feed to grid | |
| GB2505415A (en) | Pumped storage system using tide to maintain water level in lower reservoir | |
| RU2629350C1 (en) | Hydrostorage system | |
| CN110573726A (en) | Pump generator | |
| US20150337810A1 (en) | Energy Storage System | |
| US20170284360A1 (en) | Hydroelectric power generator system and method | |
| IL180052A (en) | System for generating energy from sea waves | |
| KR101389433B1 (en) | Water pumping system of hydro-electric power plant | |
| CA2848894A1 (en) | Gokhman tidal power plant for lagoon | |
| US20140319840A1 (en) | Hydroelectric system | |
| EP2302202B1 (en) | Hydraulic propulsion for increases of hydroelektric power station capacity | |
| US20110221200A1 (en) | Two-way generation tidal power plant with bypasses | |
| CN105020088A (en) | Atmospheric pressure and earth gravity power generation device | |
| KR20120003791A (en) | Pumping-up power generation system | |
| US20120200088A1 (en) | Sipoline Hydro Electric Generator | |
| CN205087118U (en) | A flexible drift island device for reservoir falling zone | |
| CN102900591A (en) | Wave eddy converting device | |
| Fahmy | An optimum operation and mathematical model of tidal energy system at Red Sea Area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20170418 |